NAPA  For the first time since New Years Eve in 2017, the Raiders faced a team other than their own.

The Lions, with first-year head coach Matt Patricia, descended on Napa for the first of two joint practices on Tuesday ahead of Fridays preseason opener between the two teams at the Coliseum.

Here are five things to know from the most intense practice of Raiders camp thus far.

Derek Carr threw his first interception

PRESS THE PANIC BUTTON!

Just kidding.

But do take note of the fact Carrs first interception came in the first practice against an actual opponent. Lions standout cornerback Darius Slay picked him off in an 11-on-11 period, and Carr was none too happy about the gaffe afterward.

It was, man, on a stupid scramble drill too, Carr said. Like out of all the places, that was the easiest time not to get one, right? So yeah I was bummed.

At least Carr wasnt as bad as EJ Manuel, who completed as many passes to the Lions as the number on his jersey. It might also end up being his ranking on the quarterbacks depth chart if he keeps playing like he did Tuesday.

Matt Patricia on Jon Gruden

Patricia has seen plenty of Gruden in production meetings over the last decade as a Patriots defensive coach and New Englands defensive coordinator since 2012. He even joked the Raiders might have an edge these next couple days with how much insight Patricia has lent Gruden in those meetings.

Tuesday morning before practice the new Lions head coach offered his thoughts on the new Raiders head coach, and how they planned for Tuesday and Wednesdays joint practices in Napa.

Hes been such a good friend to me, really through the course of the years, someone thats been really helpful, to be honest with you, in some of the meetings that weve had and the games that hes done and being able to just come in and talk football, Patricia said. He loves football, loves to talk football. It was always good for me to go into those meetings – hes gonna have a little bit of an advantage on me here – going into those meetings and breaking down defense in particular when I was at New England. Talk about, Hey, what am I doing this week? or What should I look for in the games? so hes scouted me pretty good from that standpoint.

The hospitality and to be able to plan this, it was really so easy Its been awesome.

Beasts in the backfield

Gruden lit into undrafted rookie running back Chris Warren for having too high of a pad level on a running play during team drills. The next touch Warren received, he sent Lions linebacker Jarrad Davis (a 2017 first-round pick) flying through the air. Like, his feet actually came off the ground as he fell backward.

Warren may not make the 53-man roster, but he certainly gave the Raiders a reason to take a closer look on Tuesday. His 6-foot-2, 246-pound frame is hard to ignore, and he would provide the Raiders another Marshawn Lynch-like physical presence in the backfield.

Fullback Keith Smith also showed Tuesday why the Raiders signed him in free agency, cleanly paving a running lane for Lynch while plowing over Davis, too.

Well, theyre definitely physical. I know Keith obviously, played him in college also, Carr said.  To have Keith blowing holes open the way that he can, especially with our running backs I heard a sound, I havent seen Chris run yet but I heard it was pretty awesome. Cant wait to see that.

Emmanuel Lamur makes defensive play of the day

Lamur has started only 15 of 71 games hes played in his career. During those five years, hes grabbed only two interceptions, both in 2014 with Paul Guenther as his defensive coordinator in Cincinnati.

On Tuesday, Lamur acrobatically corralled a Matthew Stafford pass during 11-on-11s for the Raiders only interception of the day.

The veteran is fighting for a starting spot, and was listed as the first-team strong-side linebacker on the teams unofficial depth chart released Monday. Lamur can be a force at 6-foot-4 and 245 pounds, and 2018 might be the season he finally makes a name for himself in the NFL. Hell be on his way to doing just that if he keeps making plays like Tuesdays.